Reversible crusher with pivoted feed chute



. Q .X 0 1 l 1 TH. T 3 N@ A a E 3 m m K 2 t M m 2 IL I; MMI V. H AIIII: l 1 0 L. K. KNIGHT REVERSIBLE CRUSHER WITH PIVOTED FEED CHUTE March 8, 1949.

Flled July 5, 1945 March 8, 1949. k K. KNI GHT' v 53,

REVERSIBLE CRUSHER WITH PIVOTED FEED CHUT E 2 Sheets-Sheet 2 Filed July 5, 1945' .m N NBN m m H m K D ill Y. i. m a fl A? m w a, \H/:

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Patented Mar. 8, 1949 UNIT ED STATES PATENT OFFICE REVERSIBLE .CRUSHER WITH PIVO-TED FEED CHUTE- Application July 5, 1945, Serial Not 603,367

6 Claims. 1

This inventionrelates to a crusherand an object of the invention. is to provide an improved adjustable feed chute particularly adapted for use with areversible crusher.

A further object of theinvention is to provide a reversible crusher in whicha single feed chute is employed to feed material to. oppositesides of the crusher rotor in the feed chamber.

Other objects of the invention will appear hereinafter, the novel features and combinations being set 'forth'in the appended claims.

In the accompanying drawings,

Fig. 1 is a side elevational view of a crusher incorporating the structure of my. invention;

Fig. 2 is an elevational sectional viewthrough the crusher of Fig. 1;

Fig. 3 isan enlarged transverse sectional view showing particularly, the mounting oithe ad- Justable crusher feed chute; and

Fig. 4 is an enlargedcombination .elevational and sectional view showing-breaker bar clamping means of the crusher.

The crusher of my invention is. generally symmetrical about a vertical plane passing through the axis of the. rotor, except for a reversible feed chute which determines the direction in which the material is fed into thefeed chamber. Said crusher includes a main frame H) which is built up of a. plurality of parts rigidly attached-together and which provides a housing for the principal working parts of the crusher. Said main frame I includes agenerally' rectangular base ll upon which is mounted a pair of side frame members, one of which'is seen at l2 which is formed by a plurality of-attached plates or segments,

As best seen in Fig, 2 of the drawings,v the main frame l0. provides a reducing chamber 13 within whichreduction of the material takes place. The sidewalls of reducing chamber l3 are provided with removable Wear plates H! which arecarried principally by the side. frame members I 2, some of'the bottom wear'plates 14, however, being carried-by the base ll.

Mounted for rotation within the reducing chamber l3is a rotor'i5 which is shown as of the swing hammer type, being provided with a plurality of swing hammers I8. Rotor IS includes a' rotor shaft [1, the opposite ends of which are mounted on appropriate bearings carriedin bearing boxes, one of which is 'seen at II; said bearing boxes l8 being mounted onpedestals provided-by the base H. Onone endthe shaft l'l carries a pulley or flexible coupling. (not shown) by which the rotor l5 may be rotated in reverse directions as desired.

Since the crusher is designed for selective reverse rotation, thus materially increasing its life without requiring the renewal of parts, it is gen-'- erally symmetricahas above mentioned.

Adjacent'the bottom portion of the reducing chamber I3 there is a'pair of spaced screens IS, the bottom bars of which maybe spaced apart to provide a free opening for the material to pass through and through the bottom of the open base ll. Adjacent the upper edge of. each screen 191 providea pairiof transversely extending breaker'bars 20'which are mounted'for adjustment toward andfrom the axis of the rotor I5'Tby adjustingmeans 2| adjacent the opposite ends of'each' bar 20. The structure of the adjustingmeans 2| is described in full detail hereinafter.

Positioned on eachtop breaker bar 20 is a scraper 22, the upper. edge of which defines the bottom limit or boundary of an exposed area at which" an upwardly and inwardly extending traveling or reciprocable breaker plate '23 is provided and a portion of which is exposed as hereinafter described more completely; The upper limit .or boundary of each exposed area is defined by the lower edge of an upper scraper 24.

Each breaker plate 23 includes a permanent backer or reinforcing. plate 25 and a pair of removable wear plates 26; The .wear plates 26 are preferably similar in construction and size and one is positioned directly above the other and removably attached: to the backing or reinforcing plate 25..by bolts or the like, not shown.

As also clearly illustrated in Fig.2 of the drawings, when a breaker plate 23 is in its uppermost position, which is the position illustrated at the leftv in Fig. 2; only one of the wear plates 26 is exposed to thechamber l3 or, in other words, is in an operative position. This, of course, is determined'by the scrapers 22 and 24. Similarly, when a breaker plate 23 is in its bottommost position, as illustrated at the right in' Fig. 2,. the other wear plate 26'alone is exposed orin operative position; As a consequence, by reciprocating the traveling breaker plates 23, the wear plates 26; or, in other words, the wearing surfaces or areasof said breaker plates 23, are successively exposed or brought into operative position.

Thebreaker plates 23 are mounted for traveling or reciprocatory motion in guide means I23 provided by the main frame In so that they may reciprocate between the. two positions illustrated or indicated in Fig. 2of'the drawings, successively exposing the upper and lower wear plates 26. This reciprocatory motion is provided by a pair of hydraulic piston motors or jacks 21, one for each of the breaker plates 23. The piston motors 21 are carried in compartments provided :by the main frame l behind the breaker plates 23 and the outer ends of their piston rods are connected by a loose or flexible connecting means 28 with the upper ends of the breaker plates 23.

The piston motors 21 are preferably interconnected so that there is a counterbalancing effect between the two breaker plates 23 in that one of them moves downwardly while the other moves upwardly. A preferred construction for doing this is disclosed and claimed in the application of Fred J. Wright, Serial No. 604,219, filed July 10, 1945, which matured into Patent 2,440,- 388 of April 2'7, 1948, and entitled Hydraulic system for reciprocating breaker plates for reversible rotary crushers.

Material to be crushed, such as iron ore, is fed to the feed chamber l3 by a pivoted or swingable feed chute 29 which is disclosed in detail in Figs. 2 and 3 of the drawings. Feed chute 29 in turn is fed from a stationary feed pipe or chute 30 which is removably attached to the main frame ID. The feed chute 29 includes a pair of upright generally arcuate end plates 32 which are interconnected by a pair of transversely extending arcuate plates 33 which are Welded or otherwise rigidly attached thereto.

Adjacent its top and center each end plate 32 is provided with a pivot pin 34 which extends outwardly through a pivotal opening in a removable plate 2 which forms a portion of each side frame member |2 of the main frame l0. Each plate I2 is provided with an arcuate bottom and with a connecting flange about its bottom and sides, as clearly illustrated in Figs. 1 and 3 of the drawings, by which it is attached to adjacent portions of the side plate I2, thus providing for ready removal of the pivoted chute supporting plates I I2. The pivot pins 34 have a common horizontal axis which'is preferably directly above the axis of the rotor l5.

The pivoted feed chute 29 also includes a pair of spaced-apart plates 35 which are substantially parallel with each other and which are parallel with the axis of the pivot pins 34. The bottoms of the plates 35 terminate along the spacedapart edges of the arcuate plates 33 and thus provide the side walls of the pivoted chute 29 which provides a bottom opening between the adjacent edges of said arcuate plates 33. In other words, the pivoted feed chute 29 provides a segment of a cylinder which is mounted on a horizontal axis with a horizontal bottom opening running substantially the full length thereof between its end plates 32, the side walls 35 of the chute acting to direct material into the feed chamber IS. The arcuate plates 33 are segments of a cylinder the axis of which is along the axis of the pivotpins 34.

By virtue of the structure of the pivoted chute 29 it is obvious, particularly by reference to Fig. 2 of the drawings, that material delivered to the stationary chute 30 may be selectively directed to opposite sides of the feed chamber l3. Furthermore, in either case one of the arcuate plates 33 will form at least a portion of a top wall of the feed chamber l3. These arcuate plates 33 are also preferably made of heavy construction since they will act also in the nature of auxiliary breaker plates, being subjected to the direct impact of material. such as crushed stone, ore and the like, which may be under reduction in the reducing chamber I 3.

One of the pivot pins 34 is provided with an operating handle 36 which, in addition to being tightly attached at its hub to the pivot pin 34, also preferably has a locking pin or key 31 extending through an arcuate slot in the plate H2 and into the adjacent end plate 32 with which it has a tight fit. The handle 36 is also preferably provided with pin and hole locking means 38 by which it may be locked in either of its tWo positions of adjustment, one being the position illustrated in Fig. 2, the other in a similar opposite position directing material to the other side of the feed chamber l3.

The structure of the adjusting means 2| by which the breaker bars 20 may be adjusted toward and from the axis of the rotor l5 and also by which the scrapers 22 may be adjusted toward and from the breaker plates 23 is disclosed particularly in Fig. 4 of the drawings, to which attention is directed. As above pointed out, for each side of the machine there are two breaker bars 20, one located above the other and these breaker bars may be adjusted independently, the adjusting means being substantially identical for each bar.

The adjusting means for each bar 20 includes a removable head 39 at its outer end which is provided with a cylindrical projection 40 which extends into a recess in the end of the associated bar 20. The head 39 thus forms a removable portion of the bar 2|] and there is such a removable head at each end of each bar- Each head 39 is provided with a threaded opening, at right angles to the axis of the bar 20, which receives a threaded shaft or bolt 4| and has a screw threaded relation therewith. Shaft or bolt 4| is mounted for free rotation in the opposite walls of a bracket 42 and is provided with removable locking collars 43, adjacent opposite ends, which hold it against axial or longitudinal movement. The bolt or shaft 4| is provided with a wrench receiving head 44 which provides for its rotation and thus provides for adjustment of the bar 20 toward or from the axis of rotation of the rotor l5.

As illustrated in the drawings, there is a spacer bar 45 located behind each breaker bar 20, but its presence is optional. In addition, there is shown a plurality of shims or spacers 46 on the opposite side of each bar 20 which provides for adjustment thereof.

The threaded shaft or bolt 4| is employed to effect the primary adjustment of the bar 20 toward and from the axis of shaft H, but the final clamping thereof is effected by a through bolt 41 (see Fig. 4), there being one of these through bolts 41 located directly behind or inwardly of each shaft 4|. As a consequence, the sectional portion of Fig. 4 is in a vertical plane through the bolt 4'! which is behind or inwardly of the bottom threaded shaft or bolt similar to threaded shaft or bolt 4 I.

The bolt 41 has a nut 48 which is received in a recess 49 formed in the bracket 42, the side walls of which recess prevent rotation of the nut 48 while its head is being turned by a wrench to clamp the breaker bar 20, spacer bar 45 and shims 46 rigidly in position. By interchanging shims 46 to opposite sides of the breaker bar 20 or by their obvious adjustments, it is evident that the position of each bar 20 may be readily adjusted.

Clamping means for each of the scrapers 22 is also provided by the bracket 42 and co-operating apparatus includinga plurality of removable or interchangeable shims 50 and a through bolt 5|, the head'of which is received in a recess 52 in the bracket -42 and held against rotation thereby. The scraper 22 is also clamped on its top and bottom between the upper breaker bar 2!! and a clamping plate 53, pressure on which is exerted bya set screw 54 carried by the upper portion of the bracket 42.

Adjustment of the upper scrapers 24 is provided by clamping and adjusting means 55 which is essentially similar in construction to the clamping and adjusting means for scrapers 22.

Inconnection with the adjusting means for bothscrapers 22 andthe bars 20, it is to be distinctly understood that while the associated shims 46 and 50 are all shown on one side thereof in each instance, they may be divided between the two sides or may all be on the opposite side, and the number and thickness of the shims may be varied over a wide range.

Hanging down from opposite sides of the screens l9 are chain screens 3| which act to guide material downwardly, the chains preventing undesirable adherence of sticky material thereto by virtue of their vibration occasioned by inherent operation of the crusher, material will be fed through the stationary chute 3i] and directed either to the right or to the left, as the case may be, by the swingable feed chute 29.

As illustrated in Fig. 2 of the drawings, the material is directed to the left and the rotor l5 will preferably be traveling in a counter-clockwise direction. Reciprocatory traveling motion will be imparted to the breaker plates 23 and, preferably but not necessarily, they will be in opposite positions; that is, one will be in its upper position while the other is in its lower position and they will travel in reverse directions, one upwardly while the other is traveling downwardly.

Material entering the feed chamber l3 will be struck by the hammers l6, producing a, primary fracture, with the particles impelled against the exposed portion of the breaker plate 23 which are first reduced thereby after said primary fracture, and which, with the parts as illustrated in Fig. 2, will be the lower left-hand Wear plate 26, with the right-hand upper wear plate 26 also exposed. However, this right-hand plate 26 will not function primarily as a breaker plate under these circumstances, though it may perform some breaking action by material carried through a complete revolution by the rotor I5.

As the breaker plates 23 reciprocate, entirely separate adjacent areas are brought into operative position or exposed to the fed chamber l3 and as the area of said breaker plate moves from its exposed position it is scraped clear of adhering material, regardless of which direction it travels. The material scraped from the breaker plates 23 is, of course, delivered to the feed chamber l3 and is subjected to the reducing action of the rotor l5.

The breaker bars 20 also co-operate materially with the hammers I6 to reduce material and by adjusting them toward and from the axis of the rotor IS, the fineness of the material may be adjusted. Material that reaches the lower portion of the reducing chamber I3 will either pass through the screens l9 or through the open area between them and out through the open bottom or base of the crusher.

To reverse the operation of the machine to a clockwise direction of rotation, it is only necessary' to reverse-the direction ofrotation 'ofthe rotor 15 and to swing the feed chute 29 by operating its handle 36 so that it is in the dotted line position illustrated in Fig. 2. of the drawings. Under these circumstances the left-hand arcuate plate 33 now becomes a top plate of the feed chamber i3, while previously the right-hand arcuate plate 33 served this function.

Obviously those skilled in the art may make various changes in the details andarrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. A reversible crusher including a frame providing a reducing chamber, travelin breaker plates on opposite sides of said reducing chamber, a reversible rotor in the reducing chamber, and an adjustable feed chute adjustable to direct material mainly toward one or the other side of the axis of said rotor, said feed chute including arcuate heavy plates adapted selectively to form top walls of said reducing chamber as said chute is adjusted.

2. A reversible crusher including a frame providing a reducing chamber, breaker plates on opposite sides of said reducing chamber, a, reversible rotor in the reducing chamber, and an adjustable feed chute adjustable to direct material mainly toward one or the other side of the axis of said rotor, said feed chute including arcuate heavy plates adapted selectively to form top walls of said reducing chamber as said chute is adjusted.

3. A crusher including a reducing chamber, a swingable feed chute for directing material to diiferent parts of said chamber, said feed chute including spaced bottom feed chamber wall forming portions curved on the arc of a circle the center of which is the pivotal axis of said feed chute, and pivot means for said chute.

4. A crusher including a reducing chamber, a pivoted feed chute for selectively directing material to opposite sides of said reducing chamber, said feed chute including a body having a pair of similar spaced surfaces which are segments of a cylinder the center of which is the pivotal axis of said chute, said chute also including spaced substantially parallel walls parallel with said pivotal axis and terminating adjacent the spaced edges of a discharge opening located between said surfaces which are segments of a cylinder.

5. A crusher including a reducing chamber, a pivoted feed chute for selectively directin material to opposite sides of said reducing chamber, said feed chute including a body having a pair of spaced surfaces which are segments of a cylinder the center of which is the pivotal axis of said chute, said chute also including spaced walls parallel with said pivotal axis and terminating adjacent the spaced edges of a discharge opening located between said surfaces which are segments of a cylinder.

6. A crusher including a reducing chamber, a pivoted feed chute for selectively directing material to opposite sides of said reducing chamber, said feed chute including a body having a pair of similar spaced surfaces which are segments of a cylinder the center of which is the pivotal axis of said chute, said chute also including spaced substantially parallel walls parallel with said pivotal axis and terminating adjacent the spaced edges of a discharge opening located between said surfaces which are segments of a cylinder, and means for swinging said pivoted feed chute on its pivotal axis and locking it in any one of a plurality of positions.

LLOYD K. KNIGHT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 94,540 Bailey Sept. 7, 1869 640,845 Webster Jan. 9, 1900 1,043,513 Dell Nov. 5, 1912 Number 15 Number Name Date Jefieries Aug. 26, 1913 Stimpson Feb. 10, 1914 Moore Aug. 1, 1916 Rapp Dec. 28, 1926 Ruprecht Mar. 29, 1927 Shelton May 22, 1928 Smith June 3, 1930 Battey Mar. 7, 1939 Hartshorn Aug. 22, 1939 Conway Jan. 2, 1940 Lafreniere Apr. 21, 1942 FOREIGN PATENTS Country Date Great Britain Mar. 9, 1907 

